function strJoint(userName,passWord){
    let arrStr = []
    let obj = {
        username: userName,
        password: passWord
    }
    for (const key in obj) {
        const element = obj[key];
        arrStr.push(`${key}=${obj[key]}`)
    }

   return arrStr.join('&')

}

function strFormat(obj){
    const arr=[]
    for(let k in obj){
        arr.push(`${k}=${obj[k]}`)
    }
    return arr.join('&')
}